I'd estimate at least since FDR, with a few interludes of sanity such as JFK's tax cuts and Scoop Jackson's defense spending.
That sounds quite plausible, thank you.
BTW I’m guessing that if JFK were alive today he would be a hardcore Dittohead and wouldn’t recognize the Dem party at all. It’s amusing that the Left views him as such a saint, as his economic policies were quite far from Clintonian.